How to pass event change to parent from child component - reference

Question

I tried to follow up "Capture references to elements" to pass change to parent from child component and it didn't work url is https://learn.microsoft.com/en-us/aspnet/core/blazor/javascript-interop?view=aspnetcore-3.0#capture-references-to-elements
Could please help me with?
a) anything wrong in code?
b) where I could find "Console.WriteLine" info since I could not find it from vs output window.
1. ParentComponent.razor
#page "/parentcomponent"
#using BlazorApp.Components
<h1>Parent Component</h1>
<p>ParentYear: #ParentYear</p>
<ChildComponent #ref="ChildComponent1" #bind-Year="ParentYear" />
#code {
private int ParentYear = 1978;
ChildComponent ChildComponent1 = new ChildComponent();
protected override void OnInitialized()
{
ChildComponent1.YearChanged += ChildFiredEvent;
}
public void ChildFiredEvent(int _year)
{
ParentYear = _year;
Console.WriteLine(ParentYear.ToString());
StateHasChanged();
}
}
2. Childcomponent.razor
<h2>Child Component</h2>
<p>ChildYear: #Year</p>
<button class="btn btn-primary" #onclick="ChangeTheYear">Change Year to 1986</button>
#code {
[Parameter]
public int Year { get; set; }
[Parameter]
public Action<int> YearChanged { get; set; }
private void ChangeTheYear()
{
Year = 1986;
YearChanged?.Invoke(Year);
}
}

Answer 1

In the child component, the YearChanged declaration should look like this:
public EventCallBack<int> YearChanged { get; set; }
And then you invoke it like this:
await YearChanged.InvokeAsync(newValue);

Answer 2

Thank you so much, Samer and David. I believe that I used previous blazor methods. Now it works fine with #ref. Cheers!!! here is code.
#page "/parentcomponent"
#using BlazorApp.Components
<h1>Parent Component</h1>
<p>ParentYear: #ParentYear</p>
<ChildComponent #ref="ChildComponent1" #bind-Year="ParentYear" />
#code {
private int ParentYear = 1978;
ChildComponent ChildComponent1 = new ChildComponent();
}
<p>ChildYear: #Year</p>
<button class="btn btn-primary" #onclick="ChangeTheYear">Change Year to 1986</button>
#code {
[Parameter]
public int Year { get; set; }
[Parameter]
public Microsoft.AspNetCore.Components.EventCallback<int> YearChanged { get; set; }
enter code here
private void ChangeTheYear()
{
Year = 1986;
YearChanged.InvokeAsync(Year);
}
}